Patent GB-1296940-A (GB)
IPC: B23K20/02
Filed: 1971-04-19
Abstract: 1296940 Welding by pressure; shearing KELSEY-HAYES CO 19 April 1971 [13 April 1970] 21953/71 Headings-B3R and B3W Apparatus for multiple upset cold pressure butt welding metal wires comprises first and second pairs of dies 27, 28; 29, 31, the dies of each pair being movable between an open position and a gripping position and the pairs of dies being movable between a spaced position and a welding position, first die operating means 75 movable between a retracted position and an actuated position for moving the dies of each pair from their open to their gripping positions, second die operating means 88, 89 movable between retracted position and an actuated position for moving the pairs of dies from their spaced to their welding positions and drive means 115 operatively connected to the first and second die operating means for moving the first means from its retracted to its actuated position which the second means remains in its retracted position and for them moving the second means from its retracted to its actuated position while the first means remains in its advanced position. Opposing faces 32, 33 and 34, 35, Fig. 5, of the dies are each provided with a wire receiving groove 54 and two larger grooves 55, 56 as shown in Fig. 6, and the dies are urged apart by spring pressed plungers 59, 65, 66, 67. The assembly of dies is held in a cavity formed in part by a block 16 and a block 22 by cover plates 24, 25 against which the dies are spring pressed, faces 36, 37 of the dies 27, 29 engaging the block 22 Fig. 2 and faces 47, 48 of the dies 28, 31 engaging a block 71. The first die operating means in the form of a gripping wedge 75 is slidable vertically in the block 16 and an inclined face 77 on the wedge engages a face 78 on the block 71. The second die operating means comprises a pair of wedges 88, 89 Fig. 3, slidable vertically against the block 16, which have inclined faces 93, 94 engaging spring pressed blocks 97, 98 carrying pins 99 engaging surfaces 49, 51 of dies 27, 28 and surfaces 53, 53 of dies 29, 31. An operating handle assembly 115 carries links 117 pivotally connected thereto at 118 and to the wedge 75 at 119, and carries a yoke 121 pivotally connected thereto at 122 and bolted to the wedges 88, 89. The yoke carries a vertical pin 124 slidable in a bore in the block 16 and engaged by a spring urged friction block 126. In operation.-With the dies in a closed welding position as shown the handle 115 is raised, pivoting about 122 as pin 124 is held by friction block 126, and moving wedge 75 upwardly to allow the dies to open. Wires held in loading means 194, 195, 189, 209, similar to that described in Specification 1,261,566 are placed one above the other in the dies one pair of which are depressed by a handle 161 so that the grooves 55 of the dies 29, 31 are aligned with the grooves 54 of dies 27, 28 and grooves 56 of dies 27, 28 are aligned with grooves 54 of dies 29, 31 and the handle 115 is returned to its initial position to close the dies on the wires. Shearing.-The lowered pair of dies is then raised by the lever 161 to shear the ends of the wires by the action of the abutting surfaces 39, 41 and 45, 46 of the dies. One sheared end of each wire is held in the aligned grooves 84 of the dies and the other sheared ends are in the grooves 55, 56 from which they are removed. The handle 115 is then raised again to open the dies a distance less than the wire diameter until the wedge 75 cannot move further. Further upward movement of the handle 115 causes pivoting about 118 and lowering of the yoke to permit the pairs of dies to move to a spaced position. The handle is then depressed to initially cause the wedge 75 to close the dies on the wires and finally to raise the yoke to move the pairs of dies into their welding positions when upsetting takes place. Upsetting is repeated several times.